§ 20.3. =The Point of Transition from the One Age to the Other= may unhesitatingly be set down at A.D. 170. The following are the most important data in regard thereto. The death about A.D. 165 of Justin Martyr, who marks the highest point reached in the Post-Apostolic Age, and forms also the transition to the Old Catholic Age; and Irenæus, flourishing somewhere about A.D. 170, who was the real inaugurator of this latter age. Besides these we come upon the beginnings of the Trinitarian controversies about the year 170. Finally, the rejection of Montanism from the universal Catholic church was effected about the year 170 by means of the Synodal institution called into existence for that very purpose. I. THE RELATIONSHIP OF EXTRA-CHRISTIAN PAGANISM AND JUDAISM TO THE CHURCH.[21] § 21. THE SPREAD OF CHRISTIANITY. Amid all the persecutions which the church during this period had to suffer it spread with rapid strides throughout the whole Roman empire, and even far beyond its limits. Edessa, the capital of the kingdom of Osrhoëne in Mesopotamia, had, as early as A.D. 170, a Christian prince, named =Abgar Bar Maanu=, whose coins were the first to bear the sign of the cross. We find Christianity gaining a footing contemporaneously in Persia, Media, Bactria, and Parthia. In the third century we find traces of its presence in Armenia. Paul himself made his way into Arabia (Gal. i. 17). In the third century Origen received an invitation from a ἡγούμενος τῆς Ἀραβίας, who wished to receive information about Christianity. At another time he accepted a call from that country in order to settle an ecclesiastical dispute (§ 33, 6). From Alexandria, where Mark had exercised his ministry, the Christian faith spread out into other portions of Africa, into Cyrene and among the Coptic races, neighbouring upon the Egyptians properly so-called. The church of proconsular Africa, with Carthage for its capital, stood in close connection with Rome. Mauretania and Numidia had, even in the third century, so many churches, that Cyprian could bring together at Carthage a Synod of eighty-seven bishops. In Gaul there were several flourishing churches composed of colonies and teachers from Asia Minor, such as the churches of Lyons, Vienne, etc. At a later period seven missionary teachers of the Christian faith came out of Italy into Gaul, among whom was Dionysius, known as St. Denis, the founder of the church at Paris. The Roman colonies in the provinces of the Rhine and the Danube had several flourishing congregations as early as the third century.